Rotary impact wrench device



Nov. 21, 1950 J. STEC ROTARY IMPACT WRENCH DEVICE 2 Sheets-Sheet 1 Filed Dec. 29, 1947 man | mliiinml WNW , INVENTOR. Joaep/z 526a,

Filed Dec. 29, 1947 J. STEC ROTARY IMPACT WRENCH DEVICE 2 Sheets-Sheet 2 ZNVENTOR:

BY Jase 072 556C,

Patented Nov. 21, 1950 UNITED STATES PATENT OFFICE ROTARY IMPACT WRENCH DEVICE Joseph Stec, Chicago, Ill.

Application December 29, 1947, Serial No. 794,379

The present invention relates to impact wrenches and has for its main object the provision of an impact wrench of a. comparatively simple construction, for use of removing or applying nuts to bolts by which wheels are mounted to the hub in a motor vehicle. oftentimesv it is impossible to remove nut from a bolt due to rust,

. unless an impact wrench is used.

A still further object of the present invention is the provision, in connection with an impact wrench of the character indicated, of a suitable device for holding the nut in a rigid stationary position while applying rotary movement to the bolt, in cases where the bolt has become disengaged from the hub. In such cases it is wholly impossible to disengage the nut from the bolt when the latter is not in a rigid stationary position.

With the above general objects in view and others that will appear as the invention is better understood, the same consists in the novel construction, combination and arrangement of parts hereinafter more fully described, illustrated in the accompanying-drawings and pointed out in the appended claims.

In the drawings forming a part of this application, and in which like designating characters refer to corresponding parts throughout the several views;

Fig. 1 is an end elevational view of the present device;

Fig. 2 is a cross-sectional view thereof, taken on line 22 of Fig. 1;

Fig. 3 is a side elevational view of a nut engaging member employed with the present device;

Fig. 4 is an end elevational view of the said nut engaging member;

Fig. 5 is a top elevational view, partly in section, of the present device;

Fig. 6 is a longitudina1 cross-sectional view through a nut engaging member, of another construction, with a bolt rotating member operable by the present device, for unscrewing the bolt from the nut in cases where the bolt has become disconnected from the hub, with means for maintaining said nut engaging member in a stationary position; 7

Fig. 7 is a perspective view of a handle for actuating the present device; and

Fig. 8 is a prespective view of the nutengaging member, last hereinabove mentioned,

Referring. to the present drawings in detail, there is shown therein a frame, includin four legs 10, which support a rectangular ledge H.

2 Claims. (01. 81-523) Said legs are connected with supporting bars I: and are strengthened by intermediate horizontal braces I3. Said ledge II defines central opening it. The longer sides of said ledge H support a pair of bearings, generally indicated by it in Fig. 1, each of which includes base l6, which is rigidly afiixed to ledge H by means of bolts l1. One of said bases l6 has an upright enlargement E3 at each end for supporting thereon, in an elevated position, a pair of tongues l9, which are pivoted upon bolts I! for horizontal angular swinging movement.

Caps 29, afiixed to bases Ed, by means of bolts 2 l, and brasses 22, complete the structure of said bearings i5.

Receivable Within each bearing [5, for rotary movement therewithin, is cylindrical shaft 23, each provided with a pair of spaced collars 24. Each pair of said collars 24 contacts the adjacent sides of each bearing [5, for preventing longitudinal movement of shafts 23 within bearings i5.

integrally formed with one of said shafts 23, in a longitudinal relation therewith is a tool engaging extension 25 and impacting block engaging extension 26. Said extension 25 is disposed outwardly of the frame, while extension 26 is directed inwardly thereof.

Integrally formed with shaft 23 at the opposite bearing I5 is wrench tool engaging extension 21, disposed outwardly of the frame, and torque block engaging extension 28, the latter projecting from the opposite end of said shaft 23. Two shafts 23 and extensions 25, 2(5, 2'! and 28 are in a longitudinal alinement. Said extensions 25, 26, 27 and 28 are square on a transverse crosssection.

Insertable upon extension 26 and frictionally held thereby is impacting block 29. Insertable upon extension 28, and held in like manner is torque block 36. Both said blocks 25 and 30 are of round formation, and at its center each is provided with a square opening for receiving their respective extensions 26 and 28, the latter being slightly tapered in a longitudinal direction in order that blocks 29 and Eli may be driven thereon and frictionally held in longitudinal relation with said extensions 26 and 28.

Integrally formed with block 29 and extending from its operative face is a pair of diametrically arranged ribs 3!. Similar ribs 32 are provided at the operative face of torque block 3!]. When said blocks 29 and 30 are in an operative, face to face relation, as shown in Figs. 1, 5 and 6, the two 3 pairs of ribs 3! and 32 are in a staggered alternate relation, as shown in Fig. 2.

By virtue of the said arrangement the two pairs of ribs 3! and 32 have a clutch-like action, so that when a rotary movement is imparted to block 29, a rotary movement will be transmitted to block 39 by virtue of the interlocking of the two pairs of ribs 3i and 32. However, when block 29 is rotated no rotary movement is transmitted to block 38 until the two pairs of ribs 31 and 32 actually come in contact. During an interval of time prior to the two pairs of ribs 3i and 32 actually coming in contact it is possible to impart to ribs iii an impacting motion for striking ribs 32 in order to impart to block 30 a forceful and sudden impact into a rotary direction, which in turn is transmitted to extension 21 which acts upon a nut to be unscrewed, and which action is considerably more forceful than the ordinary turning of a wrench. By virtue of the diametrical arrangement of the two pairs of ribs 3! and 32 and their mutual staggered relation, it is possible to impart to block 29 the impacting action substantially to 180 degrees.

Insertable upon wrench tool engaging extension 2'! is wrench member 33 of a tubular formation, provided adjacent one of its ends with a square bore 34, within which said extension El is insertable. At the opposite end of said member 33 there is polygonal socket 35 whereby a nut to be unscrewed from a bolt is engaged.

To impart an impacting rotary action to block 29, suitable tool shown in Fig. '7, is provided. The same includes head 36 provided at its center with square bore 3? for engaging extension 25. A pair of bars 38, terminating with handles 39, laterally project from said head 36. Said bars 38 are in a longitudinal alinement. Upon inserting extension 25 within bore 3i, manual angular swinging motion through handles 39 is imparted to bars 38 for imparting impacting rotary action to block 29 through shaft 23 and extensions 25 and 26, for the purpose hereinabove described.

It often happens that bolt 45 becomes disengaged from hub 41 contacting with felly 42. In such case it is a dihicult matter to unscrew nut 43 from said bolt 48, because rotary movement imparted to nut 43 by ordinary means is transmitted to bolt 4%, and the latter not being firmly 1 and rigidly anchored within hub 41 or felly 42, thereby causing the rotation of both said bolt 49 and nut 43. By an attachment, presently described and operated by the impacting device, it is possible to support nut 43 in a rigid stationary position, while applying rotary movement to the square free end 44 of bolt 45.

The attachment aforesaid includes a tubular member 45, provided adjacent one of its ends with diametrically opposed slots 46. At the opposite end of said tubular member 45, and inwardly thereof there is polygonal socket 41 for receiving and engaging nut 43. When tongues I9 are shifted towards said tubular member 45 and brought into said slots 46, said tubular member 45 will be thereby locked to the frame of the impacting device, preventing said tubular member 45 to make any rotary shifting movement in either direction. This looks nut 43 to the impacting device, preventing said nut 43 from rotating in either direction.

Rod 48 is insertable within tubular member 45 in a concentric relation therewith. At one end said rod 48 has an integrally formed cylindrical extension 49, substantially corresponding in diameter to the inner diameter of said tubular member 45. Said extension 49 snugly fits within said tubular member 45, but is permitted to make free rotary movement therewithin. Centrally and longitudinally of said extension 49 square bore 50 is made, within which extension 2'! is insertable.

The opposite end of said rod 48 has a reduced, square extension 5! receivable within a corresponding bore made in cylindrical block 52. Ball and socket connection 53 carried by said extension 5| maintain the latter in a frictional engagement with said cylindrical block 52 for preventing the latter and rod 48 to disengage during insertion of the two into said tubular member 45.

Made at the opposite end of said cylindrical block 52 is a polygonal central bore 54 for receiving and engaging the square end 44 of bolt 40.

By virtue of the construction of'the said attachment hereinabove described and due to the engagement thereof with nut 43 and bolt 40, impacting rotary motion is imparted by block 29 to block 30. Said motion is transmitted to rod 48 due to the engagement of extension 21 therewith. Said motion is in turn transmitted by rod 48 to block 52, and the latter, due to its engagement with polygonal end 44 of bolt 40, transmits the same to said bolt 40. Thus, while nut 43 is gripped by tubular member 45 and thereby held keyed to the frame of the impacting device through the medium of tongues [9, bolt 40 receives impacting rotary motion, as hereinabove described, and is unscrewed from nut 43.

While there is described herein a preferred embodiment of the present invention, it is nevertheless to be understood that minor changes may be made therein without departing from the spirit and scope of the invention as claimed.

What I claim as new is:

1. An impact wrench device for unscrewing nuts from bolts, comprising a pair of shafts supported in a longitudinally alined relation for rotary movement, a pair of blocks rigidly set upon the inner ends of said shafts in a face to face relation, ribs integrally formed on the adjacent faces of said blocks, the ribs in the two blocks being in an alternate mutual relation and shiftable upon a common plane in a transverse relation to said shafts, means for imparting a rotary movement to one of said shafts, and a nut engaging member carried by the other of said shafts, the rotary movement imparted to said first named shaft on. operation of said means causing one of saidblocks to make a rotary movement for impacting the ribs of said last named block against the ribs of the other of said blocks, the impacting force imparted to the last named ribs being transmitted to said second named shaft for effecting an impacted rotary movement in said nut engaging member.

2. An impact wrench device for unscrewing nuts from bolts, comprising a pair of shafts supported in a longitudinally alined relation for rotary movement, a pair of circular blocks each mounted upon the inner end of each shaft, said blocks being arranged in a face to face mutual relation, a plurality of radial ribs carried by the opposed faces of each of said blocks, the inner ends of said ribs in each of said blocks being in a spaced relation to-the center of each block, the ribs of one block being in a staggered alternate relation with the ribs of the other of said blocks, the two groups of said ribs being arranged on a common plane transverse to said shafts so that when one of said blocks is rotated its ribs laterr 5 ally engage the ribs in the other of said blocks in a clutchlike manner, means for imparting a rotary movement to one of said shafts, and a nut engaging member carried by the other of said shafts, the rotary movement imparted. to said 5 REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,131,225 Farkell Mar. 9, 1915 1,389,468 White Aug. 30, 1921 1,648,430 Wahl et a1. Nov. 8, 1927 1,846,638 Gardiner et a1 Feb. 23, 1932 2,049,273 Pott July 28, 1936 2,267,012 Bowne Dec. 23, 1941 2,308,428 Ronning et a1. Jan. 12, 1943 

